the rack as a whole seems very light on utilities - 'the dull polish that keep the shiny modules shining'
I would basically fill the skiff with a variety of these - you can get a lot more out of the modulation sources that you have by multing, mixing and modifying them more - a matrix mixer is especially useful, as are small mixers, offsets, polarizers, switches etc etc etc

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities